20701543 has 4 divisors (see below), whose sum is σ = 20711368. Its totient is φ = 20691720.

The previous prime is 20701523. The next prime is 20701553. The reversal of 20701543 is 34510702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34510702 = 2 ⋅17255351.

It is a cyclic number.

It is not a de Polignac number, because 20701543 - 2⁵ = 20701511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (5177842).

Almost surely, 2^20701543 is an apocalyptic number.

20701543 is a deficient number, since it is larger than the sum of its proper divisors (9825).

20701543 is an equidigital number, since it uses as much as digits as its factorization.

20701543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9824.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20701543 is about 4549.8948339495. The cubic root of 20701543 is about 274.5791601628.

The spelling of 20701543 in words is "twenty million, seven hundred one thousand, five hundred forty-three".